Dust-collector.



No. 703,|24. l Patented lune 24, |902.

P. EBERWEIN.

.DUST. C.LLECTOB. Application med Mar. 2a. 19061.)l Ho Model.) l 4Sheets-Sheet I.

THE Nonms PETERS we. Pnooumo.. wnsnmsvon. u4 c.

No. 763,424. Patented lune 24, |902.

P. aeawem.

DUST COLLECTOR.

iApplication led Hari 23, 1900., (llolodel.) 4.Sheets-Sheet 2.

mi nofws PETERS cn. Puofoungo., wnsmnoron, b. C.

No. 703,!24. Patentedlune 24, |902.

P. EBERWEIN. W

QUSTFLLETQ. ('Apbliweion med mar. 2s, 1900.)

4 Sheets-Shout 3.

(No Model.)

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no. 7o3,|24. Patnted June 24, |902. P. EBEnwem.

DUST COLLECTOR: (Application led Mar. 23, 1900,)

4 Shets-Sheet 4.

(No Model.)

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uorduwo.. wAsNmaYoN D c 1H: Noni UNTTnD STATES ll/WENTV OFFICE.

PAUL EBERVEIN, 0F JACKSON, MICHIGAN.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 703,124, dated June 24,1902.

Application tiled March 2S, 1900. Serial No. 9.862. (No model.)

To @ZZ wiz/0m, llt may 0071.007171,.-

Beit known that I, PAUL EBERWEIN, a citizen of the United States,residing at Jackson, in the county of Jackson and State of Michigan,have invented new and useful Improvements in Dust-Collectors, ot whichthe following is a specitcation.- i

This invention relates to that class of dustcollectors which compriseupright lteringchambers, which are open at the top and bottom-an upperchamber, into which the dustladen air is blown and from which it passesinto the filtering-chambers, and a lower chamber, which receives theseparated dust from the filtering-chambers and from which the dust isdischarged, while the purified air escapes through the cloths of theiilteringchambers into the surrounding atmosphere. A dust-collector ofthis kind is described and shown in Letters Patent No. 633,954, grantedto me September G, 1899.

The objects of this invention are to im-` prove the means whereby thefiltering-chambers are jarred for dislodging the deposited dust from thefilter-cloths; also to improve the mechanism whereby the cut-off devicesare actuated which control the admission of the dust-laden airto thefiltering-chambers, so as to exclude the air-current from thefilteringchambers for a considerable period of time; also to improve theconstruction of the ltering-chambers, so as to facilitate theapplication of the cloth thereto and the dislodgment of the dust fromthe cloths; also to improve the cleaning action upon the cloths byproviding the dust-receiving chamber with a suction-passage, by which itis placed in communication with the fan which delivers the dustladen airto the ltering-chambers, so as to produce a reverse draft through thefiltering cloths while the cloths are being jarred.

In the accompanying drawings, consisting ot' four sheets, Figure l is aside elevation of a dust-collector provided with my improvements. Fig. 2is a vertical longitudinal section of the same. Fig. 3 is a reverseelevation of the slide guide-bar and bracket. Fig. et is an endelevation of the dust-collector. Fig. 5 is a vertical section of thedust-collector through one of the filtering-chambers. Fig. (l is ahorizontal section, on an enlarged scale, in line G (l, Fig. 2. Fig. 7is a horizontal section through the upper portion of one of thefiltering-chambers in line 7 7, Fig. 5, on an enlarged scale. Fig. S isa perspective view of one ot' the filtering-chambers viewed from thefront. Fig. 9 is a perspective view of the upper rear corner of one ofthe filtering-chambers. Fig. l0 isa side elevation of the bearingbywhich the hammershaft is connected with the shifting lever. Fig. ll isa horizontal section iu line ll 1l, Fig. 10.

Like letters of reference refer to like parts in the several figures.

A represents the upper horizontal chamber, into which the d ust-ladenair is blown through a spout a by a fan A. B is the lower horizontalchamber, which receives the collected dust and from which the dust isremoved by a longitudinal endless sweep ZJ and a transverse conveyer b.

b2 b3 represent. the posts whichconnect the upper and lower chambers atthe corners thereof and at the middle. i

C C represent the two groups of upright filtering-chambers, which arearranged between the upper and lower chambers A B and connected at theiropen upper and lower ends with the upper and lower chambers bytransverse slots a a2, formed, respectively, in the bottom of the upperchamber and the top of the lower chamber.

The iltering-chambers are each composed of a light rect-angular woodenframe, which is open at its upper and lower ends and over which thecloth is stretched. These chainbers are shown in detail in Figs. 5, 6,7, 8, `and 9, and are constructed as follows: D represents the uprightrear bar or stile ot' the frame of each filtering-chamber. This stile islprovided ou its innern face o r side with an upright rib d, which is as'wide as thespace within the chamber. E represents the filtercloth,which is secured with its rear ends to upright strips e, which aresecured to opposite sides of this rib by transverse bolts e'. Frepresents the upright front bar or stile, which has the same width asthe rib CZ of the rear stile. This bar is made of springy or elasticwood and is normally curved in the direction of its length, s o that itsmiddle stands slightly farther from the rear stile than its upper andlower ends. The cloth is bent of the cloth by the cleaning device.

around the front side of this front stile. The upper and lower ends ofthis front stile are connected with the upper and lower ends of the rearstile by horizontal bars G, which are secured to the sides of the rib dof the rear stile by screws g and to the front stile by transverse boltsg', Fig. 7. The space between the two bars G and the front and rearstile at the same end of the frame is open and registers with one of theslots of the adjacent dust-chamber. The bars G are provided on theirouter sides with longitudinal rabbets g2, by which thefiltering-chambers are guided on the transverse rails or cleats g3,which are secured to the top and bottom chambers A B. In fastening thecloth to the frame the front stile is straightened by external pressure.Upon releasing the front stile after the cloth has been fastened to thesides of the rear stile the front stile springs back to its normalcurved form and stretches the cloth. As the cloth is free to draw aroundthe front stile in stretching, the cloth is stretched to an even tensionon both sides of the frame, which insures a uniform jarring The upperand lower ends of the cloth are then tacked to the upper and lowersides, respectively, of the horizontal bars G.

When the ltering-chambers are of large size, the upper and lowerhorizontal bars G on the same side of the chamber are connected at themiddle of each flat side by upright strips g4, which support the clothagainst the internal air-pressure, which bulges the cloth outwardly. v

Each filtering-chamber is jarred by an individual hammer or knocker,which strikes against the elastic front stile of the chamber. Eachhammer is operated repeatedly for a certain length of time, so that thefilteringchamber is struck a number of times in order to thoroughlydislodge the dust which has been `deposited against the cloth. Theseveral hammers which act upon the same group of filtering-chambers areactuated simultaneously and the two groups of hammers are actuatedalternately. This striking or jarring mechanism is constructed asfollows: H, Figs. l to 5, represents the hammers or knockers, which arearranged on the front side of the machine, so as to strike against theelastic curved front stile F of the chambers, at or near the middlethereof. Each stile is provided with a wear plate or washer f where thehammer strikes the stile, and the hammer is preferably provided with afacing h, of rubber orother soft material,to deaden the sound. Eachhammer-head is secured to the lower end of an upright flexible arm orbar 7L', and the upper ends of the arms of the same group of hammers aresecured to a cross-bar 712, which is supported at each end byahorizontal hinge 713, connecting the cross-bar to the front wall of theupper air-chamber A. The hammer-arms ofv the same group are connectedabout midway between the ends of the vits front side a yoke l'.

arms by a horizontal bar Z, which carries on m represents a horizontalshaft which is arranged across the front of the machine and passesthrough these yokes. This shaft is journaled' in bearings m', secured tothe posts b2 b3 of the machine, and is provided near each yoke withanactuating device m2, which may be a cam or eccentric, as shown. The twoactuating devices, cams, or eccentrics are so arranged on the shaft thatwhen one of the same is in engagement with its yoke the other is out ofengagement with its yoke, and that by a short longitudinal movement ofthe shaft in one direction or the other-one actuating device can beengaged with and the other disengaged from its yoke. The shaft isrotated -by any suitable means-for instance, as shown, by a pulley n andbelt at' from a driving-pulley n?. These pulleys are provided withlianges to prevent the belt from running oif by the shifting of theshaft. The actuating-cam, which is in engagement with its yoke, movesthe latter back and forth repeatedly, while this engagement lasts andvibrates the hammerarms, whereby each hammer-head is caused to strikeits chamber repeatedly. As the blows fall upon the elastic front stileof the frame of each filtering-chamber the cloth is thor-.

oughly jarred.

As each filtering-chamber is struck separately by its individual hammer,each chamber is struck with full force and is thoroughly cleaned by theblow or blows. If the front stiles of the several chambers in the samegroup are not exactly in line, as is frequently the case, the cleaningof the several chambers is nevertheless effected thoroughly anduniformly, because each chamber receives the effect of the jarringmechanism individually. When a single hammer is arranged to act upon agroup of such chambers, the latter are jarred unequally, because theblow is received by the chamber which projects farthest, while thechambers which stand farther back receive little or no agitation.Furthermore, as each individual hammer is attached to a separatefiexible arm the hammers need not be exactly in line nor the arms ofexactly the same spring tension or flexibility, as the swing or momentumof each hammer-head will bring the latter into forcible contact with thefront stile of its chamber. The apparatus therefore works properlyandefliciently under the variations in the position of the parts whichare likely to exist in machines of this kind. As each hammer is sure tostrike its chamber, the power required to strike an effective blow isnot nearly as great as that which would be required to strike a group ofchambers by a single hammer.

The mechanism whereby the hammer-shaft m is intermittently shifted isconstructed as follows: O, Figs. l, 2, and 4, is a horizontal shaftwhich is arrangedacross the end of the machine above the longitudinalhammershaft m and which is journaled in bearings IIO , therighting-spring on that side of the lever,`

O. The shaft O is preferably driven by a sprocket-wheel O2 and chain O3from a wheel O4 on a lower horizontal shaft O5, which latter may bedriven by a train of gearing O6 from the endless sweep b, as showninFigs. l and 4. P represents a rocking shifting lever which isconnected with the end of the hammer-shaft for shifting the latterlengthwise. The upper portion of this lever has the form of an openelliptical loop p, and the lever is pivoted at its lower end upon atransverse stud p', which projects forwardlyfrom a bracket p2, securedto the adjacent post. The shifting lever is connected to the end of thehammer-shaft, between the loop of the lever and its pivot, by anysuitable meansfor instance, as shown in Figs. l, 4, 10, and 1l, by abearing q, which is held on the shaft between collars q and horizontalscrews g2, which enter vertical slots qs in the sides of the bearing andare mounted on the lever and in a bracket Q4, secured to the rear sideof the lever. The latter is oscillated by a crank (15 on the end of theshaft O. The end of this crank engages alternately againstactuatingfaces q, formed on the opposite sides of the loop p. Thesefaces are concentric with the shaft O, except that the entering end ofeach face is sloping to facilitate the engagement of the crank with theface. The loop p is preferably provided with a guide-loop Q7, whichextends across the loop p from one actuatingface to the other concentricwith the pivot of the lever and which straddles the shaft O and guidesthe lever in its oscillatory movement on the shaft. r represents tworighting-springs, which bear against opposite sides of the shiftinglever, between the pivot and the loop thereof, and which are mountedupon a rod r', which is curved concentric with the pivot. This rod issecured at its ends to a bifurcated support r2, which is secured at itsmiddle to the front portion of the stud p', which forms the pivot of theshifting lever. These springs tend to hold the latter' in its verticalposition, in which both actuatingcams m2 are out of engagement with theyokes Z and both groups of hammers are at rest. The shifting lever isallowed to stand in this position during that part of the movement ofthe crank during which the latter does not bear against eitheractuating-face of the lever. When the crank engages against one of theactuating-faces, it swings the lever to one side of its perpendicularposition, compresses and shifts the hammer-shaft toward that side,whereby the corresponding actuating-cam is engaged with its yoke and thecorresponding group of hammers is actuated. The vibration of this groupof ham mers continues during the period during which the crank sweepsover this actuating face. lVhen the crank has passed beyond thisactuating-face, the compressed righting-spring returns the shiftinglever to its vertical position and shifts the hammer-shaft to theposition in which neither actuating-cam is in engagement.` The partsremain in this position until the crank reaches the oppositeactuating-face, when the lever and shaft are shifted to the oppositeside and the other actuating-cam is engagedw-ith its yoke, therebyactuating the other group of hammers. i

S, Fig. 2, represents the upper cut-off slide, which is arranged uponthe bottom of the upper dust-chamber A and controls the admission of thedust-laden air alternately to the two groups of filtering-chambers.

T represents the lower cutoff slide, which is arranged underneath thetop of the lower dustchamber B and controls the admission ofthe dust tothe lower chamber alternately from the two groups of filtering-chambers.These slides are constructed and arranged substantially as described andshown in my abovementioned Letters Patent. In order to hold the upperslide closed and the lower slide open during a considerable period oftime, sufficient to thoroughly jar the chamber of the group which is cutoff and allow the dust to settle, these slides are not reciprocated by acrank-movement, as in my former patent, but by a cam-movement, which isshown in Figs. 2, 3, 4, and G and which is constructed as follows: s isa cam-arm or wiper which is secured to the upper shaft O and whichengages alternately against cams s s, formed at opposite ends of aguide-bar s3, which is secured to the outer end of the stem s4 of theupper slide C and which forms a longitudinal continuation of this stem.This guide-baris provided with a longitudinal slot S5, by which itstraddles the shaft O. s is a bracket secured to the adjacent end wallof the upper air-chamber A and provided with a longitudinal slot S7,which receives a guide pin or roller 53 on the outer' end of theguide-bar s3. As the rotating cam-arm s engages against the cam s itshifts the upper slide in one direction. The slide remains in thisposition during the time during which the `cam-arm rotates from the cams to the cam s2, which movement occupies the greater part of thesemicircular path of the arm between the two cams. The arm then strikesthe cam s2 and shifts the slide in the opposite direction and leaves theslide in this position while it rotates toward the cam s. By this meansthe slide is shifted from one position to the other by a short quickmovement and remains in either position during a considerable period oftime, thereby allowing ample time for keeping the dust-laden air shutoff from the group of chambers which is being jarred and enabling thechambers to be thoroughly cleaned and allowing the dust to settle. Thelower slide is shifted in like manner by a camarm t, secured to thelower shaft O5 and engaging with cams 1S t2 on a guide-bar t3, which issecured to the stem t* of the lower slide and provided with alongitudinal slot t5, which receives the shaft O5, and with a pin t,which is guided in a slot i7 in a bracket 15S.

IOO

IIO

In order to facilitate the operation of dislodging the dust from thecloths, the lower dust-chamber B is provided with a suctionspout U,which connects this chamber with the eye of the fan by which thedust-laden air is propelled to the upper dust-chamber A. When thedust-laden air is shut off from a group of ilteringchambers by the upperslide and these chambers are placed in communication with the lowerchamber B by the lower slide, an air-currentis drawn into these chambersbythe suction applied to the lower chamber by the spout U. Air is nowdrawn through the cloth inwardly or in a reverse direction while thecloth is being jarred, and this reverse current greatly facilitates theremoval of the dust from the cloth.

I claim as my invention- I. In a dust-collector, the combination of afiltering-chamber which is open at its upper and lower ends and whichhas an elastic front stile sprung to a bow shape and arranged with itsconcave side inwardly, a filter-cloth supported at the front of thechamber by said stile, whereby the cloth is stretched, and a hammerarranged to strike the salient portion of said stile for jarring thercloth, substantially as set forth.

2. The combination of an upper chamber which receives the dust-ladenair, a lower chamber which receives the separated dust, vertical, flat,filtering chambers arranged side by side between said upper and lowerchambers and communicating therewith at their upper and lower ends, acorresponding series of individual hammers adapted to strike the narrowupright side of each ltering chamber separately, flexible arms to whichthe hammer-heads are secured, and

mechanism whereby said arms are actuated simultaneously, substantiallyas set forth.

3. The combination of an upper chamber which receives the dust-ladenair, a lower chamber which receives the separated dust, vertical, fiat,ltering-chambers arranged side by side between said upper and lowerchambers and communicating therewith at their upper and lower ends, acut-od device which temporarily shuts off the dust-laden air from saidfiltering-chambers, a series of individual hammers adapted to strikeeach ltering-chamber separately,`flexible arms to which the hammer-headsare secured, and mechanism whereby said arms are actuated whilethedust-laden air is shut off, substantially as set forth.

4. The combination with a series of filtering-chambers arranged side byside, 0f a corresponding series of individual hammerheads adapted tostrike each chamber separately, a corresponding series of flexible armsto which the hammer-heads are secured, a cross-bar connecting said armsbetween the supported ends of the latter and the hammer-heads, and anactuating device whereby multaneously, while said hammer-heads are alsocapable of individual movement by reason of the flexibility of saidarms, substantially as set forth.

5. The combination withthe filtering-chambers,'of a series of individualhammers adapted'to strike each chamber separately, means whereby thearms of said hammers `are connected for simultaneous operation, a rotaryshaft capable of longitudinal movement, an actuating device mounted onsaid shaft and adapted to be engaged with and disengaged from saidconnecting means by the longitudinal movement of said shaft, and meansfor shifting said shaft lengthwise, substantially as set forth.

6. Thecombinationwiththefiltering-chambers, of a series of individualhammers adapted to strike each chamber separately, a crossbar connectingthe arms of said hammers and provided with a yoke, a rotary shaftcapable of longitudinal movement, and an actuatingcam mounted on saidshaft and adapted to be engaged with and disengaged from said yoke bythe longitudinal movement of said shaft, substantially as set forth.

'7. The combination with the filtering-chambers, their striking device,and the longitudinally-movable rotary shaft whereby the striking deviceis actuated, of a rocking shifting lever connected with' said shaft formoving the same alternately in opposite directions and provided with twoopposite actuatingfaces, and a rotary crank which engages alternatelywith said faces and shifts said rocking lever from one side to the otherand holds 'the lever in either position while traveling IOO IIO

with two opposite actuating-faces, a rotary crank which engagesalternately with said faces and shifts said lever from one side to theother,and righting-springs bearing against the lever and tending to holdthe same in its central position, substantially as set forth.

9. The combination with two groups of ltering-chambers, their strikingdevices, and a longitudinally-movable rotary shaft provided with meanswhereby each striking device is actuated, of a rocking shifting leverconnected with'said shaft and provided with two oppositeactuating-faces, and a rotary crank which engages alternately with said-faces and shifts said lever from one side to the other, therebyalternately engaging one of said actuating means with the strikingdevice and disengagin g the other from its striking device,substantially as set forth.

I0. The combination with two groups of filtering-chambers, theirstriking devices, and a longitudinally movable shaft, of means whereby acontinuous rotary movement is imparted to said shaft, a rocking shiftinglever connected with said shaft for moving the same alternately inopposite directions, an actuating device whereby said shifting lever isalternately shifted from one side to the other, and cams for actuatingsaid striking devices arranged on said shaft in such position that oneof said cams is engaged with its striking device and the other isdisengaged from its striking device by the longitudinal movement of theshaft, substantially as set forth.

ll. The combination with an upper chamber which receives the dust-ladenair, a lower chamber which receives the separated dust, and verticaliiltering-chambers arranged between said upper and lower chambers andcommunicating therewith at their upper and lower ends, of a cut-offslide which controls the communication of one of said chambers with saidfiltering-chambers, a rotary arm for actuating said slide, and camsconnected with said slide and adapted to be alternately engaged by saidarm, thereby shifting the slide alternately from one position to theother and allowing the slide to remain at rest while the arm rotatesfrom one cam to the other, substantially as set forth.

12. The combination with an upper chamber which receives the dustladenair, a lower chamber which receives the separated dust, and verticalilteringchambers arranged between said upper and lower chambers andcommunicating therewith at their upper and lower ends, of a cut-offslide which controls the communication of one of said chambers with saidfiltering-chambers, a guide-bar connected with the outer end of saidslide and provided with two oppositely-arranged cams,

a stationary guide device which engages with said bar, and a rotary armwhich alternately engages said cams, substantially as set forth.

13. The combination with the upper chamber which receives the dust-ladenair, the lower chamber which receives the separated dust, uprightfiltering-chambers arranged between said upper and lower chambers andcommunicating therewith at their upper and lower ends, a cut-offdevice-which controls the communication of said upper chamber with saidfilteringschambers, Aand the fan which propels the dust-laden air tosaid upper chamber, of a suction-passage connecting said lower chamberwith the suction side of the fan, whereby a reverse air-current is drawnthrough the cloth of the filtering-chambers when the latter are cut offfrom said upper chamber, substantially as set forth.

fitness my hand this 17 th day of March, 1000.

PAUL EBERWEIN.

